[Qt练习]QSting

stringdlg.h

#ifndef DLGSTR_H
#define DLGSTR_H
#include <QDialog>
class QString;
class QPushButton;
class QLineEdit;
class QTextEdit;
class QString;
class DlgStr:public QDialog
{
    Q_OBJECT
public:
    DlgStr(QWidget *parent = 0);
public slots:
    void slot_show_txt();
private:
    QPushButton *btnOk;
    QLineEdit *lineEdit;
    QTextEdit *txtEdit;
    QString str;

};


#endif // DLGSTR_H

stringdlg.cpp

#include <QPushButton>
#include <QLineEdit>
#include <QTextEdit>
#include <QString>
#include <QTextStream>
#include <QVBoxLayout>
#include "dlgstr.h"

DlgStr::DlgStr(QWidget *parent):QDialog(parent)
{
    btnOk = new QPushButton("OK");
    lineEdit = new QLineEdit;
    txtEdit = new QTextEdit;

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(lineEdit);
    layout->addWidget(txtEdit);
    layout->addWidget(btnOk);
    setLayout(layout);
    connect(btnOk,SIGNAL(clicked()),this, SLOT(slot_show_txt()));

}

void DlgStr::slot_show_txt()
{
    txtEdit->setText(lineEdit->text());
    QTextStream cout(stdout);
    cout <<"you input txt " <<lineEdit->text() << endl;
}

main.cpp

#include <QApplication>
#include "dlgstr.h"

int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    DlgStr *dlg = new DlgStr;
    dlg->show();
    return app.exec();
}